TEMPO gridded NO2 tropospheric and stratospheric columns V02 (NRT) (PROVISIONAL)

Nitrogen dioxide Level 3 (PROVISIONAL) files provide trace gas information on a regular grid covering the TEMPO field of regard for nominal TEMPO observations. Level 3 files are derived by combining information from all Level 2 files constituting a TEMPO East-West scan cycle. The files are provided in netCDF4 format, and contain information on tropospheric, stratospheric and total nitrogen dioxide vertical columns, ancillary data used in air mass factor and stratospheric/tropospheric separation calculations, and retrieval quality flags. The re-gridding algorithm uses an area-weighted approach. The nitrogen dioxide near real-time (NRT) files are produced using a fast version of the TEMPO baseline retrieval processor. The TEMPO NRT products are useful for applications with low-latency requirements (<2-3 hours after observation is taken). The NRT processing optimizes radiance calibration, image navigation and registration, and cloud and trace gas retrievals for rapid processing, while ensuring that product quality is sufficient for most NRT applications.

二氧化氮三级（临时）文件可提供覆盖常规TEMPO观测视场范围的规则网格痕量气体信息。三级文件由构成TEMPO东西向扫描周期的全部二级文件的信息融合得到。此类文件采用netCDF4格式存储，包含对流层、平流层及总二氧化氮垂直柱含量数据，用于空气质量因子（air mass factor）与平流层/对流层分离计算的辅助数据，以及反演质量标记（retrieval quality flags）。其重网格化算法采用面积加权方法。二氧化氮近实时（NRT）文件通过TEMPO基线反演处理器的快速版本生成。TEMPO NRT产品适用于具备低延迟需求的应用场景（观测完成后2至3小时内）。NRT处理流程针对快速处理优化了辐射定标、图像导航与配准，以及云与痕量气体反演环节，同时确保产品质量可满足多数NRT应用的需求。